Summary
Summary OCR A-Level Biology 6.1.2 Regulation of Gene Expression
- Course
- Institution
- Book
Revision summary of key knowledge from OCR A-Level Biology 6.1.2 Regulation of Gene Expression.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
OCR A-level Biology notes
-
OCR A-Level Biology 6.3.5 Gel Electrophoresis
-
OCR A-Level Biology 6.3.4 Polymerase Chain Reaction
Seller
Follow
izzylewington04
Content preview
Regulation of GeneExpression
Eukaryotic Transcriptional Level
Hormones act as second messengers and pass through the plasma membrane to bind to
and activate transcription factors
Activated transcription factors bind to a promoter region on a chromosome near a gene
Transcription factors aid or inhibit RNA polymerase in binding to the promoter region
and beginning transcription
Prokaryotic Transcriptional Level
Lactose Absent
o Regulator gene codes for a repressor protein
o Repressor binds to operator region (LacO)
o RNA polymerase cannot bind to the promoter region so cannot begin
transcription
o Structural genes are inactive which conserves amino acids
Lactose Present
o Lactose acts as an inducer and binds to the repressor molecule
o Repressor-Inducer complex cannot bind to the operator region (LacO)
o RNA polymerase binds to the promoter region and begins transcription
o LacY codes for lactose permease which makes the membrane more permeable to
lactose, so lactose enters the cell
o LacZ codes for β-galactosidase which hydrolyses lactose into glucose and
galactose for respiration
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.88. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79223 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now